Magnesium is a non-combustible metal. (True or False). Also write the false statements in their correct form.
False. Because, Magnesium is a combustible metal. When magnesium is in its metal form, it will burn very easily in... View Article
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Name the tool used with a tractor for sowing seeds in a field. What are the advantages of using this tool?
a) A tool used with a tractor is Seed Drill. It is used to sow seed at a uniform distance.... View Article
Cells of root nodules of leguminous plants fix nitrogen. State True or False. Correct the false statements.
False Bacteria called as Rhizobium present in the root nodules of leguminous plants fix nitrogen. It is a soil bacterium... View Article
Illustrate only a plant cell as seen under an electron microscope. How is it different from an animal cell?
Both plant and animal cells comprise membrane-bound organelles, such as endoplasmic reticulum, mitochondria, the nucleus, Golgi apparatus, peroxisomes, lysosomes. They... View Article
Which of the following is not a constituent of petroleum? (a) paraffin wax (b) lubricating oil (c) petrol (d) coke
d) Coke Coke is a product obtained from coal, whereas the rest are obtained by refining of petroleum through fractional... View Article
Which is the first enzyme to mix with food in the digestive tract? (a) Pepsin (b) Cellulase (c) Amylase (d) Trypsin
c) Amylase Explanation Amylase is defined as a digestive enzyme that breaks starch into small carbohydrate molecules. This enzyme is... View Article
Which one of the following diseases is not caused by bacteria? (a) Typhoid (b) Anthrax (c) Tuberculosis (d) Malaria
d) Malaria Explanation Malaria is a mosquito-borne infectious disease caused by various species of the parasitic protozoan microorganisms called Plasmodium.... View Article
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.
Water turns into ice when temperature decreases to 0°C. Water turns into steam at 100°C when heat is supplied to... View Article
Which disease is not transmitted by mosquitoes? (a) Dengue (b) Malaria (c) Brain fever or encephalitis (d) Pneumonia
d) Pneumonia Explanation Pneumonia is an inflammatory condition of lung affecting the lung alveoli. It is caused by a virus... View Article
Epithelial layer does not allow regulation of materials between body and external environment. (True or False)
False Epithelial cells allow regulation of materials between body and external environment. They allow selective transfer of materials between body... View Article
Which of the following tissues has dead cells? (a) Parenchyma (b) Sclerenchyma (c) Collenchyma (d) Epithelial tissue
(b) Sclerenchyma cells are the permanent tissues present in the plants. They provide hardness and stiffness to the plant and... View Article
The substances which have very low __________ temperature and can easily catch fire with a flame are called __________ substances.
The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances.... View Article
A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron.
The tablet is not made of iron metal, instead it contains a salt of iron. Oral iron is given as... View Article
All the living organisms are basically made up of C, N, S, P, H and O. How do they enter the living forms? Discuss.
The substances like C, N, S, P, H and O enter the living body through biogeochemical cycles. The atmospheric carbon... View Article
Major source of mineral in soil is the (a) parent rock from which soil is formed (b) plants (c) animals (d) bacteria
a) Parent rock from which soil is formed Explanation The lichens growing on the rocks release certain chemicals that break... View Article
Which one of the following disease is not transmitted by mosquito? (a) Brain fever (b) Malaria (c) Typhoid (d) Dengue
(c) Typhoid Explanation Typhoid is caused by bacteria called as Salmonella typhi. It is a water-borne disease. Typhoid patient’s faeces... View Article
Cork cells are made impervious to water and gases by the presence of (a) cellulose (b) lipids (c) suberin (d) lignin
c) Suberin A suberin lamella is found in the suberized cells of cork tissue. It is separated from the contents... View Article
The growth of pollen tubes towards ovules is due to (a) hydrotropism (b) chemotropism (c) geotropism (d) phototropism
b) Chemotropism Explanation There are few chemical substances, which are actively responsible for bringing a curvature movement in plant organs.... View Article
The dead element present in the phloem is
(a) companion cells (b) phloem fibres (c) phloem parenchyma (d) sieve tubes Answer: (b) phloem fibres Explanation: They are dead... View Article
The jelly-like fluid substance present in cells is called (a) protoplasm (b) chromosome (c) chloroplast (d) cytoplasm
(d) cytoplasm The fluid that fills up the cells is referred to as the cytoplasm. It encompasses the cytosol with... View Article
